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Ion-dipole will between just as it sounds: an ion (something with a charge) and a dipole (a polar molecule). Sometimes the ion will be in the form of something with an actual charge, like K+ in water. Sometimes the ion will come from a soluble ionic compound, like when KCl is put in water, it breaks up into K+ and Cl-... thus ion-dipole forces will result between the ions in KCl (K+ and Cl-) and water. Does this make sense?
@@sajol7250 HCl is a molecular compound and NOT an ionic compound (because H and Cl are both nonmetals and the H is covalently bonded to the Cl - not made of ions). It's a polar molecule (dipole) because the electrons are not evenly distributed (gather closer to the Cl). So if I have an HCl (dipole) and another HCl (dipole)... the force between them is a dipole-dipole force.
